Electric water heater



June 12, 1928.

v M. lsAAcS ELECTRIC WATER HEATER Filed Jan. 17, 1927 Patented June 12, 1928.

UNITED g .STATES PATENT oFFlcs.

MABKVISAACS, or MINNEAPOLIS,` MINNESOTA;

ELECTRIC WATER HEATER.

Application filed January 17, 19,27, Serial No. 161,655, and in Canada December 18, 1925.

The invent-ion relates to improvements in electric water heaters and particularly to a comparatively small, large capacity, water heater which can beattached toa cold water tap or` faucet andan object ofthe invention is to provide a'heater which when s0 attached will effectively heat the water passing lthrough the heater upon, the tap or faucet being turned on, thereby permitting one to have hot water instantaneously from a cold water tap. j j

A further object of the invention is to construct the heater in a simple and durable manner and so that it can be conveniently carried about and such that it can be readily connected to the tap and to the customary house lighting circ-uit.

A further object is to construct the heater so that the water passing therethrough is divided into a considerable number of streams which arey separately heated by a surrounding heating coil and further to provide means for distributing and limiting the quantity of water entering the heater from the tap. f

Vith the above more important objects in View, the invention consists essentially in the arrangement and construction of parts hereinafter more particularly described, reference being had to the accompanying dra-wing, in which Fig. 1 is a side view of the heater attached to a tap and connected up with the customary house lighting circuit.

Fig. 'is an enlarged detailed vertical sectional view centrally through the heater.

Fig. 3 is a horizontal sectional view through the heater, the section being taken at 3v3 Figure 2.

Fig. 4 is a view showing diagrammatically the manner in which the several heating coils are connected.

Fig. 5 is a vertical sectional View at 5-5 Figure 2.

In the drawing like characters of reference indicate corresponding parts in the sev,- eral figures.

A cylindrical metallic casing 1 is provided, this casing having the ends thereof open and exteriorly screwthreaded to receive similar upper and lower closure caps 2 and 3 which are somewhat frusto-conical. in shape and are provided at theirk smaller ends with vertically aligned bosses4 and 5.

The caps are provided with internal shoulders 6 and the cylinder is lined with a suitable insulating material 7. Similar upper and lower circular hand plates 8 and 9 are inserted within the caps, the plates seating against the shoulders 6. The plates are connected byv similar suitably disposed and rspaced copper tubes 10 having their ends permanently fastened to the plates in any suitable manner and opening therethrough. The tubes are each surrounded by a tubular insulator' 11 such as of mica and the inner vfaces of the plates 8 and 9 are covered with an insulating material 12 through which the ends of the tubes pass. Each tube is surrounded rby a heating wire coil 13, the coil encircling the mica insulatorv and the several coils are connected in the present instance in series in the manner best shown in Figure 4.

The casing 1 is provided at one side with an outstanding internally screw threaded boss 14 which receives a screw threaded insulating ferrule 15 and feed wires 16 and 17 extend from the customary two-contact plug18 through the ferrule and connect with the terminal wires of the adjacent heating coil. A semi-spherical perforated sprayer or nozzle 19 is inserted through the upper end of the boss 4 and is suitably suspended in place at the base of the boss as by screw threads indicated at 20. An asbestos packing ring 21 is inserted in the boss 4 above the nozzle and a rubber gasket 22 is placed within the packing ring. The discharge end of the customary cold water service tap or faucet 23 is adapted to pass into the rubber gasket making a water tight joint therewith. The lower boss 5 forms a discharge korifice, at the bottom of the heater.

lVhen the hea-ter is to be used for heating cold water, it is placed on the tap or faucet in the manner shown and the plug 1S is connected in the usual manner with the customary house lighting circuit which latter causes the several heating coils surrounding the tubes to become heated and to heat the tubes. s The water discharging from the faucet strikes the sprayer or nozzle and is distributed over the top plate 8 and finds its lway down through the tubes in thin streams and is heated to a high temperature in passage with the result that the passing watery discharges through the orifice or boss 5 very The holes in the nozzle are so gauged that they limit the quantity of water passing through the tubes so that no more Water is adinitted to the tubes than can be heated by the capacity of the coils. lVhat I claiin as my invention is l. An electric water heater comprising an interiorly insulated cylindrical body having kthe ends thereof exteriorly screw threaded,

interiorly yinsulated circular heads entering' and closing the upper'and lower ends of the Y screw oit'the heads,-.saidupper cap being fitted with -a `tap receiving inlet opening and said lower cap beiiigprovided with avdischarge orifice, electric heating coils connected in seriesand surrounding the tubes and ,lead Wires eX- tending through the side `of the cylinder and coiniinin-icating with the coils.

2.-An electric water heater comprising an interiorly insulated cylindrical body having the ends thereof exteriorly screw threaded, interi'orly insulated circular heads entering and closing the upper and lower ends of the body, exteriorly insulated inetallic spaced water tubes perii'ianently connecting the heads and opening` therethrough, iirustoconical, upper and lower caps interiorly screw threaded to receive the exterior threads ot the upper andlowerends ci' the body and provided adjoining Athe threads with internal shoulders engaging the edges of the heads, said upper cap being fitted with ra tap receiving inlet opening and said lower cap being provided with a discharge orifice,

a sen'ii-spherical, perforated, water distributing andY con-trolling` sprayer located at the inner endof the inlet opening, electric heating coils connected in series and suriounding'the tubes 'and leadrwires extending through the side of the cylinder and communicating with the coils. Signed at Minneapolis, Hennepin County, Minnesota, U. S. A., Vthis 4th day of January, 1927.

MARK Isaacs. 

